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Chemistry · PYQ NEET UG 2018

हिन्दी

In the reaction, \( \text{C}_6\text{H}_5\text{OH} + \text{CHCl}_3 + \text{NaOH} \longrightarrow \text{C}_6\text{H}_4(\text{OH})\text{CHO} \) the electrophile involved is

  1. dichloromethyl cation \( (\text{CHCl}_2^+) \)
  2. formyl cation \( (\text{CHO}^+) \)
  3. dichloromethyl anion \( (\text{CHCl}_2^-) \)
  4. dichlorocarbene \( (:\text{CCl}_2) \)

Correct answer · Option 4

dichlorocarbene \( (:\text{CCl}_2) \)

Explanation

This is Reimer-Tiemann reaction. Chloroform and base generate dichlorocarbene \( (:\text{CCl}_2) \) as the reactive electrophile.
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